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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
The following table summarizes intangible assets, net (in thousands):
 
March 31,
2019
 
December 31,
2018
Developed technology
$
13,383

 
$
13,383

Channel partner relationships
730

 
730

Capitalized development costs(1)
2,959

 
2,918

Customer relationships
380

 
380

 
17,452

 
17,411

Accumulated amortization:
 
 
 
Developed technology
(12,348
)
 
(12,222
)
Channel partner relationships
(267
)
 
(233
)
Capitalized development costs(1)
(1,768
)
 
(1,655
)
Customer relationships
(318
)
 
(303
)

(14,701
)
 
(14,413
)
Total finite-lived assets, net
2,751

 
2,998

Indefinite-lived intangible assets - trade names
350

 
350

Total intangible assets, net
$
3,101

 
$
3,348

________________
(1)
Includes the impact of foreign currency exchange rate fluctuations.